Reykjavik has the world's largest and most sophisticated geothermal district heating system, which has used natural hot water to heat its buildings and homes since 1930. Today, geothermal powers the entire city - with an electricity distribution network harnessing 750 MW thermal power from steam, and a water distribution system generating 60 million cubic meters of hot water. The use of this natural resource has massively reduced the City's dependence on fossil fuels – making it one of the cleanest cities in the world. CO2 emissions have been reduced from 1944 to 2006 by up to 110,000,000 tons, delivering savings of up to 4 million tons CO2 every year. Geothermal has also contributed to Iceland's transformation from one of the poorest nations to one that enjoys a very high standard of living.